JP4163597B2 - Fuel tank - Google Patents

Description

  The present invention relates to a fuel tank provided with a filter member inside in order to separate foreign matters such as water and dust mixed in fuel.

Conventionally, a fuel tank including a fluororesin element as a filter member is known (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 4-123364 (FIG. 6)

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining the basic structure of the prior art. An overflow passage 102 is provided around the fuel filler lid 101, and an auxiliary fuel tank 102 is provided at a portion where the overflow passage 102 communicates with the main fuel tank 103. The fuel tank 102 was closed with a filter member 105 made of fluororesin.
In addition, a drain hole 106 for allowing rainwater to flow outside is provided in the overflow passage 102.

  The overflowed fuel is separated into moisture and fuel by the fluororesin filter member 105. The fuel component passes through the filter member 105 and is collected from the auxiliary fuel tank 102 to the main fuel tank 103. On the other hand, moisture such as raindrops passes through the drain hole 106, reaches the drain passage 107, and is discharged out of the machine body.

  However, since the fluororesin filter member 105 is arranged in parallel with the bottom surface of the drain passage 107, there is a possibility that moisture remaining in the overflow passage 102 covers the filter member 105. When the moisture covers the filter member 105, the water film exerts a blocking action, preventing the passage of fuel and preventing smooth filtration.

  An object of the present invention is to supply a fuel tank having a filtration mechanism for smoothly filtering the moisture of fuel mixed with moisture over a long period of time.

The invention according to claim 1 is a fuel tank of a type that guides the fuel in the tank to the outside of the tank through a filter member having a fluororesin element that does not allow water to pass but allows fuel to pass. As a vertically long cylinder, this cylinder has at least one element that is inclined, and the cylinder is made up of walls that do not allow fuel and water to pass, except for the upper and lower openings, and the inclined element has an upper opening. It is characterized by covering the part .

Since the element of at least one surface is inclined and arranged on the filter member that is a vertically long cylindrical body, the moisture separated by the element is less likely to cover the entire surface of the element. That is, since the elements are inclined, even if moisture adheres to the lower part of the element, the upper part functions.
Therefore, since the margin of allowance until the separated water increases to cover the entire surface of the elements constituting the filtration surface can be secured, fuel can be smoothly filtered over a long period of time compared to the case where the elements are horizontally arranged.

The cylinder that forms the filter member is composed of walls that do not allow fuel and water to pass except for the upper and lower openings, and the sloped element is placed on the upper opening, so separated moisture, dust, sand, Foreign matter such as fragments of plants fall off and collect in the lower part outside the cylinder.
That is, since the foreign matter falls off from the element, moisture and foreign matter adhering to the inclined element can be effectively removed, and can be filtered smoothly for a longer period.

  In the invention which concerns on Claim 1, since the element was inclined and arrange | positioned in the cylinder which forms a filter member, there exists an advantage that it can be filtered smoothly over a long period of time.

In addition, the filter member is made up of a wall that does not allow fuel and water to pass except for the upper and lower openings, and the inclined element is placed on the upper opening, so that moisture and foreign matter adhering to the element can be effectively removed. There are advantages.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of an engine according to the present invention. The engine 11 includes a crankcase 12, a cylinder block 13 that is bolted to the crankcase 12, and a crankshaft 14 that extends vertically from the crankcase 12. It was. Then, the recoil starter 15 is attached to the upper end of the crankshaft 14, the starter grip 16 is attached to the recoil starter 15 via a string, and the lower end of the crankshaft 14 is configured to be the output shaft.

In the figure, 17 is a fan cover, 18 is a fuel tank, 19 is a filler port, and 21 is a filler port cap. In order to supply fuel, the fuel supply pipe 23 was extended from below the fuel tank 18 and connected to the carburetor 25 via the fuel cock switch 24. Reference numeral 26 denotes a throttle lever.
Reference numeral 28 denotes an air cleaner unit that supplies clean air filtered to the carburetor 25.

FIG. 2 is a plan view of the engine according to the present invention, and shows that the fan cover 17 is attached to the engine with fixing bolts 29. 31 is a weir provided on the upper surface of the fan cover 17 and is a member for preventing the fuel from entering the inside of the fan cover 17 when fuel is injected.
In addition, 32 is a brake lever and 33 is a silencer unit.

  FIG. 3 is a plan view of the fuel tank according to the present invention. A hole 36 for the recoil starter is formed at a substantially central portion of the upper surface of the fan cover 17 which also serves as the upper half of the fuel tank 18. Shows that the fuel supply port 19 is provided.

4 is a cross-sectional view taken along line 4-4 of FIG. 3, and shows that a fuel tank member 37 that is the lower half of the fuel tank 18 is fixed from below the fan cover 17 that also serves as the upper half of the fuel tank 18. FIG. The materials are both olefin materials, and the fixing is performed by heat bonding. However, the fixing is not necessarily limited to the olefin material and the heat bonding. For example, the material can be a steel plate and can be fixed by bending and turning around the member on one side.
Then, a cylindrical body 39 is erected upward from the lower part of the fuel tank member 37, and an element 45 made of a fluororesin having a property of passing water but not allowing fuel to pass through the cylindrical body 39 is attached.

  Returning to FIG. 3, a fuel discharge port 38 is extended to the fuel tank member 37 (see FIG. 4), and a cylinder 39 is provided at the inlet of the fuel discharge port 38. The cylindrical body 39 is a member composed of a first vertical wall portion 41, a second vertical wall portion 42, a third vertical wall portion 43, and a fourth vertical wall portion 44 in the clockwise direction in the figure.

  FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3, and a fuel tank member 37, which is the lower half of the fuel tank 18, is fixed from below the fan cover 17, and a cylinder 39 is attached upward from the bottom of the fuel tank member 37. This shows that the element 39 made of fluororesin is attached to the cylindrical body 39.

  That is, in the fuel tank 18 of the type that guides the fuel in the tank to the outside of the tank through the filter member 46 including the cylinder 39 and the element 45, the filter member 46 includes the vertically long cylinder 39 and the element 45. It is a member. An element 45 is provided to be inclined to the cylindrical body. The cylindrical body 39 is configured by a wall that does not allow the passage of fuel and water except for the inlet of the fuel discharge port 38 that is the upper opening 48 and the lower opening 49, and the inclined element 45 is put on the upper opening 48. .

  More specifically, the height h2 of the second vertical wall portion 42 constituting the cylindrical body 39 is set up so as to be higher than the height h4 of the fourth vertical wall portion 44, that is, h4 <h2. The element 45 is attached to the upper surface 42 a of the second vertical wall portion 42 and the upper surface 44 a of the fourth vertical wall portion 44. And the fuel discharge port 38 is provided in the horizontal direction from the inner lower part of the cylinder 39. Reference numeral 44 b denotes a rib for reinforcing the fourth vertical wall portion 44.

  In addition, the 3rd vertical wall part 43 (refer FIG. 4) and the 1st vertical wall part 41 which stood up in the figure back-and-back direction show the trapezoid shape, and the cylinder 39 and the element 45 which consist of these four vertical wall parts, The filter member 46 was configured.

Hereinafter, the operation of the fuel tank according to the present invention will be described.
FIG. 6 is an operation diagram of the fluororesin element arranged at an inclination. This element 45 is made of fluororesin and has a property of allowing water to pass but not allowing fuel to pass.
When the fuel (F + D) mixed with moisture reaches the element 45, only the fuel component F passes, and the foreign matter D such as moisture, dust, sand, mushrooms, and vegetation does not pass along the inclined element 45. Fall off and gather at the bottom of the cylinder 39.
As a result, moisture and foreign matter adhering to the element 45 can be effectively removed.

FIG. 7 is an operation diagram showing separation of moisture and the like from the fuel.
Since the element 45 is inclined and disposed on the filter member 46, the moisture separated by the element 45 is less likely to cover and block the entire surface of the element 45. That is, since the elements are inclined, even if moisture adheres to the lower part of the element, the upper part functions.

Therefore, since the margin of allowance until the separated moisture etc. D increases to block the entire surface of the element 45 can be secured, fuel can be filtered smoothly over a longer period of time compared to the case where the elements are arranged horizontally.
As a result, smooth fuel supply can be maintained through the fuel supply pipe 23.

  The cylindrical body 39 is constituted by a wall 40 that does not allow fuel and water to pass except for the upper opening 48 and the lower opening 49, and the inclined element 45 is placed on the upper opening 48.

The cylindrical body 39 forming the filter member 46 is constituted by a wall 40 that does not allow fuel and water to pass except for the upper opening 48 and the lower opening 49, and the inclined element 45 is covered with the upper opening, so that it is inclined. The foreign matter D such as moisture, dust, sand, mud, and vegetation separated by the element 45 falls off and collects in the lower part 51 outside the cylinder.
That is, since moisture and foreign matter D drop off, the moisture and foreign matter adhering to the inclined element 45 can be effectively removed, and can be filtered smoothly for a long period of time.

  8 is a cross-sectional view taken along the line 5-5 in FIG. 3. FIG. 5 is a sectional view taken along line 5-5 in FIG. It shows that the fluororesin element 45 is mounted at a height h5 so as to be inclined and face each other. That is, the element 45 is a member having two inclined surfaces 45L and 45R.

In the second vertical wall portion 42 and the fourth vertical wall portion 44 constituting the cylindrical body 39, the height h2 of the second vertical wall portion 42 and the height h4 of the fourth vertical wall portion 44 are the same or substantially the same. Like that. Then, the element 45L is attached to the upper surface 42a of the second vertical wall portion 42, and the element 45R is attached to the upper surface 44a of the fourth vertical wall portion 44. Reference numeral 44 b denotes a rib for reinforcing the fourth vertical wall portion 44.
In addition, the 3rd vertical wall part 43 and the 1st vertical wall part 41 which are standing upright in the figure back surface show the shape of a substantially pentagon, and consist of these four vertical wall parts 41, 42, 43, and 44. The tubular member 39 and the elements 45L and 45R constitute the filter member 46.

Although the inclined element 45 attached to the filter member 46 has two faces, it may be three faces, and there is no restriction on the number of inclined faces.
Furthermore, although the cross-sectional shape of the cylinder having the vertical wall portion is rectangular in the embodiment, it is not limited to the rectangle. For example, it may be circular or elliptical.

  In addition, a part or all of the vertical wall portion constituting the cylindrical body may be replaced with an element. For example, it is also possible to replace the entire vertical wall portion with an element and configure the entire filter member with the element together with the inclined surface.

  The fuel tank according to the present invention is applied to a general-purpose gasoline engine in the embodiment, but may be applied to a fuel tank of a general-purpose diesel engine.

  The fuel tank according to the present invention is suitable for a general-purpose gasoline engine.

1 is a side view of an engine according to the present invention. 1 is a plan view of an engine according to the present invention. It is a top view of the fuel tank concerning the present invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is an effect | action figure of the fluororesin element arrange | positioned inclined. It is an effect | action figure which shows isolate | separating a water | moisture content etc. from a fuel. It is another Example figure of FIG. It is a figure explaining the basic composition of the prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 18 ... Fuel tank, 38 ... Fuel discharge port, 39 ... Cylindrical body, 41 ... 1st vertical wall part, 42 ... 2nd vertical wall part, 43 ... 3rd vertical wall part, 44 ... 4th vertical wall part, 45 ... Element 46... Filter member 48. Upper opening 49 49 Lower opening

Claims (1)

In a fuel tank of a type that guides the fuel in the tank to the outside of the tank through a filter member having a fluororesin element that does not allow water to pass but allows fuel to pass through,
The filter member is a vertically long cylinder, and includes at least one element inclined to the cylinder,
The cylinder is constituted by a wall that does not allow fuel and water to pass except for the upper and lower openings, and the inclined element covers the upper opening.

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